This study aims to assist fracturing design to achieve minimal deviation in multiple fracture propagation and create deeper and To investigate the initiation and propagation of multiple hydraulic fractures with 10 injection clusters that are distributed in two horizontalīoreholes.
In this study, a fully coupled two-dimensional (2D) extendedįinite-element method (XFEM)–cohesive zone model (CZM) in combination with a phantom-node method (CPNM) was used in ABAQUS The literature, although it is of critical importance for fracturing optimization.
Of the dynamic zipper fracture growth because of changing flow rates, well spacing, and injection time does not appear to have been studied in Operational parameters, such as multiple-cluster and well spacing, flow rates, and injection time, play a vital role in the deviationĪnd growth of multiple-cluster hydraulic fractures during the implementation of modified zipper fracturing technology. The variations of Thomsen’s coefficients and damage parameters in mudstone are obviously greater than that of sandstone, which may be due to the induced damage between rocks and drilling fluid of mudstone is much higher than sandstone. The changes in mechanical parameters, Thomsen’s coefficients and damage parameters rapidly changed in the range of 1.0–1.8 times of borehole radius. At the same radial position, the vertical elastic modulus is smaller than that of the horizontal, the degree of anisotropy for P-wave is greater than that of S-wave, and the horizontal damage parameter is greater than that of the vertical, which indicated that the micro-cracks near the wellbore mainly occur in the horizontal direction. The results indicated that the Poisson's ratio and damage parameters decrease with increasing in radial distance, while the elastic modulus and Thomsen’s coefficients increase. Therefore, this paper aims to investigate the damage characteristics of transversely isotropic tight sand formation, the rock mechanical and damage parameters in the vicinity of the wellbore were calculated using acoustic logging data. The velocities of elastic waves are usually reduced in the presence of rock damage, it may be used for determining the progressive damage of the rock. The rock mechanical behavior and damage characteristic is of great importance for in situ stress evaluation, wellbore stability analysis and hydraulic fracturing design. Our model can simulate fracture spacing effect on fracture profile when combining IFD with Discontinuous Displacement Method (DDM). Our simulator has been validated by comparing with an analytical solution as well as Ribeiro and Sharma model. Our simulator is able to handle anisotropic formations with multiple layers. It also calculates the mass/heat transport of injected hydraulic fluids as well as proppants. Our simulator conducts coupled thermal-hydraulic-mechanical simulation of the initiation and extension of hydraulic fractures. Our simulator is based on integrated finite difference (IFD) method, In this method, the simulation domain is subdivided into sub domains and the governing equations are integrated over a sub domain with flux terms expressed as an integral over the sub domain boundary using the divergence theorem. In this paper, we present the development of a three-dimensional thermal-hydraulic-mechanical numerical simulator for the simulation of hydraulic fracturing operations in tight sandstone reservoirs. To produce gas from the low-permeable unconventional formations, hydraulic fracturing technology is essential and critical. During the past years, the recovery of unconventional gas formation has attracted lots of attention and achieved huge success.
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